Organic EL display and production device of color filter cross reference to related application

ABSTRACT

A device for producing a color filter includes a part for storing a solution in which a light transmitting material is dissolved, a part for feeding the solution to a tip of a flying electrode, a part for applying a voltage between the tip of the flying electrode and an electro-conductive material of a color filter substrate so as to form an electrostatic field, and a part for relatively shifting the tip of the flying electrode and the color filter substrate to a perpendicular direction and to a horizontal direction. The solution is formed into a stringy beam which is let to fly onto the color filter substrate so that the solution is injected into a concavity formed and surrounded by a black matrix on the color filter substrate, and forms red, green and blue light emitting layers.

CROSS REFERENCE TO RELATED APPLICATION

[0001] This is a continuation of U.S. application Ser. No. 10/105,336,filed Mar. 26, 2002, the subject matter of which is incorporated byreference herein.

FIELD OF THE INVENTION

[0002] This invention relates to an organic EL (electro-luminescence)display forming light-emitting layers capable of making a full colordisplay, and to a device for production of a color filter.

BACKGROUND OF THE INVENTION

[0003] An organic EL element is an element constituted of a thin filmcontaining a fluorescent organic compound, said film being held betweena cathode and an anode. When an electron and a hole are injected intothe thin film and recombined, an exciton is formed, and uponde-activation of the exciton, a light (fluorescent light orphosphorescent light) is emitted from the element.

[0004] Characteristic feature of the organic EL element consists in thatit can emit a surface light having so high luminance as 100 to 100,000cd/m2 at a low voltage of 10 V or less, and it can emit a light rangingfrom blue color to red color by selecting the kind of fluorescentmaterial.

[0005] In WO 99/48339, there is disclosed a technique of forming a fullcolor display type organic EL display by subjecting an organic ELmaterial which has so far been considered impossible to pattern to anink jet process (the piezo jet process and the process of dischargingthe material by the action of thermally caused bubble formation).

[0006] However, the above-mentioned WO 99/48339 makes no mention aboutthe means for letting fly an organic EL material against fine pixels andthe method for improving the reliability by giving a flying drop shapenecessary for forming a uniform organic light emitting layer andpreventing the clogging of ink jet nozzle.

SUMMARY OF THE INVENTION

[0007] For letting an organic EL material fly by the ink jet process, itis necessary to dissolve the organic EL material in a solvent to form adilute solution so that the drops can fly.

[0008] Further, for vaporizing off the solvent after flying of thesolution and thereby forming an organic light-emitting layer, it is alsonecessary that the solvent used has a high volatility.

[0009] However, in the hitherto adopted piezo driving ink jet process orthe discharging process by the thermally caused bubble formation, thenozzle has to have a small diameter at the ink jet head in order to makesmall the flying quantity of organic EL material solution so as to matchwith the fineness of pixel. As its result, a solvent of high volatilitydries up at the tip of nozzle to cause clogging of the nozzle.

[0010] Further, it has been difficult in the ink jet process (the piezojet process and the discharging process by thermally caused bubbleformation) to form a uniform organic light-emitting layer because, inthe ink jet process, the solution of organic EL material flies in theform of fine dots and a pixel is formed as an assembly of the dots.

[0011] This invention aims at solving the problems mentioned above, andthe object thereof is to provide a production device of organic ELdisplay capable of making a full color display by patterning red-,green- and blue-colored uniform organic light emitting layers at everypixel in a high reliability by the action of an electrostatic field. Afurther object of this invention is to provide an organic EL displaywhich is uniform and free from color mixing, by the use of saidproduction device.

[0012] The device of this invention has a means for storing a solutionin which a light emitting material is dissolved, a means for feeding thesolution to a tip of a flying electrode, a means for applying a voltagebetween the tip of the flying electrode and an electrically conductivematerial of an organic EL substrate and thereby forming an electrostaticfield, and a means for relatively shifting the tip of the flyingelectrode and the organic EL substrate to a perpendicular direction andto a horizontal direction, and is so constructed that the solution isformed into the form of a stringy beam from the tip of the flyingelectrode to let it fly onto the organic EL substrate, thereby injectingthe solution into a concavity formed and surrounded by banks on theorganic EL substrate, and forming red, green and blue light emittinglayers.

[0013] Other objects, features and advantages of the invention willbecome apparent from the following description of the embodiments of theinvention taken in conjunction with the accompanying drawings.

BRIEF DESCRIPTION OF THE DRAWINGS

[0014]FIG. 1 is a cross-sectional view illustrating the productiondevice of the organic EL display of this invention.

[0015]FIG. 2 is an enlarged view of FIG. 1 in the direction of P.

[0016]FIG. 3 is a diagram illustrating the disposition of the colordisplay part of the organic EL display in FIG. 1.

[0017]FIG. 4 is a view illustrating the a-a′ cross section of theorganic EL display of FIG. 3 and the b-b′ cross section of the organicEL display of FIG. 6.

[0018]FIG. 5 is a view illustrating the c-c′ cross section of theorganic EL display of FIG. 3.

[0019]FIG. 6 is a view illustrating the disposition of the color displaypart of the organic EL display according to another example.

[0020]FIG. 7 is a view illustrating the d-d′ cross section of theorganic EL display of FIG. 6.

[0021]FIG. 8 is a view illustrating the d-d′ cross section of theorganic EL display of FIG. 6 after the cathode formation.

[0022]FIG. 9 is a schematic view illustrating an image displaying deviceusing the organic EL display of FIG. 8.

[0023]FIG. 10 is a cross-sectional structural view of a color filter.

[0024]FIG. 11 is a cross-sectional view illustrating the productiondevice of an organic EL display according to another example.

[0025]FIG. 12 is a cross-sectional structural views of FIG. 11.

[0026]FIG. 13 is a cross-sectional structural view of FIG. 12.

EXPLANATION OF THE SYMBOLS

[0027]1—organic EL display, 2—solution flying device, 3—flyingelectrode, 3-1—tip of flying electrode, 4—electrode holder, 5—voltageapplying circuit, 6—solution, 6-1—solution beam, 7—container, 8—solutiontransporting path, 9—electro-conductive material, 11—bank, 12—insulatinglayer (SiO2), 13—electro-conductive layer, 14—transparent electrode,15—glass substrate, 20—cathode, 31—flying electrode, 31-1—tip of flyingelectrode, 32—control electrode, 32-1 tip of control electrode, 33—glasssubstrate, 33-1—tip of glass substrate, 34—resin film, 35—insulatingprotective film, 36—resin film, 37—solution feeding path, 38—resin film,39—solution feeding hole, 40—cover, 41—solution recovering member,42—minute gap, 50—voltage applying circuit, 61—organic EL display,62—display part, 63—data driving circuit, 64—scanning circuit,65—electric current supply circuit, 66—substrate, 67—data line, 68—gateline, 69—common electrode, 70—electric current supply line, 100—colorfilter, 110—black matrix, 130—ITO transparent electrode, 150—glasssubstrate.

DETAILED ESCRIPTION OF THE INVENTION

[0028]FIG. 1 illustrates one embodiment of the production device of theorganic EL display of this invention.

[0029] In FIG. 1, 1 is an organic EL display, 2 is a solution flyingdevice, 3 is a flying electrode, 4 is an electrode holder, 5 is avoltage applying circuit, 6 is a solution in which a light-emittingmaterial is dissolved, 7 is a container, and 8 is a solutiontransporting path.

[0030] The flying electrode 3 is made of an electro-conductive metal.For example, it is a stainless pipe having an inner diameter of 150-250μm. The flying electrode tip 3-1 has a sharp pointed shape, and is heldso as to keep a narrow gap g from the organic EL display 1.

[0031] To the flying electrode tip 3-1 is fed the solution 6 fromcontainer 7 made of glass or the like through a solution transportingpath 8 made of Teflon tube or the like.

[0032] A direct current high voltage of about 1.5-3 kV is applied to thevoltage applying circuit 5 in the above-mentioned state, whereby a highelectrostatic field can be formed between the flying electrode tip 3-1and the electro-conductive material 9 via the electrode holder 4 made ofan electro-conductive metal.

[0033] Herein, the solution 6 is a solution of a light-emitting materialsuch as PPV (polyparaphenylenevinylene) derivative in a high electricresistance solvent such as xylene or the like, and its electricresistance is preferably 107 Ω·cm or more, and its surface tension ispreferably 30 mN/m or less.

[0034] Due to formation of the above-mentioned high electrostatic field,the solution 6 flies from the flying electrode tip 3-1 toward theorganic EL display 1.

[0035] As a method for feeding the solution 6 to the tip 3-1 of theflying electrode, the present example uses an elevation head z betweenthe liquid surface of the solution in container 7 and the flyingelectrode tip 3-1. The flying of solution can be retained so far as thefeeding of solution 6 to the flying electrode tip 3-1 and an applicationof a high voltage to the voltage applying circuit 5 are continued.

[0036] In the example of FIG. 1, the organic EL display 1 is placedperpendicularly, the flying electrode 3 is placed horizontally, and theflying direction of the solution 6 is fixed downward. It is alsopossible, however, to place the organic EL display 1 upward, the flyingelectrode 3 downward, and the flying direction of solution 6 downward.Further, it is also possible to make fly the solution 6 in an obliquedirection from the viewpoint of overall layout of the device.

[0037]FIG. 2 is an expanded view from P direction of the neighborhood offlying electrode 3 of FIG. 1. The solution 6 supplied to tip 3-1 of theflying electrode forms a stringy solution beam 6-1 stretched in thedirection of arrow A from the flying electrode tip 3-1 to the organic ELdisplay 1 due to the electrostatic field between flying electrode tip3-1 and electro-conductive material 9, and continuously flies.

[0038] Accordingly, by shifting the organic EL display 1 and the flyingelectrode tip 3-1 relatively to each other in the direction of arrow B,a straight line of solution 6 can continuously be pictured on thesurface of organic EL display 1, and thereby the solution 6 can beinjected into surface of the organic EL display 1. By varying thevelocity of the shifting, the amount of solution 6 injected can becontrolled.

[0039] Among the means for forming the electrostatic field of FIG. 1,control of the direct current voltage applied to the voltage applyingcircuit 5 or control of the gap g is useful for varying thickness of thestringy solution beam 6-1.

[0040] It is also possible to control the amount of injected solution6-1 into the organic EL display 1 by in-series applying a pulse voltage(not shown in the drawing) to the voltage applying circuit 5 of FIG. 1in addition to the above-mentioned direct current voltage, and so as tocut the stringy solution beam 6-1 of FIG. 2 intermittently.

[0041] It is also possible to cut the stringy solution beam 6-1 of FIG.2 intermittently by lowering the direct current voltage applied to thevoltage applying circuit 5 of FIG. 1.

[0042]FIG. 3 illustrates one example of the color display disposition ofthe organic EL display 1, wherein 1-R is red-colored pixel, 1-G isgreen-colored pixel, and 1-B is blue-colored pixel. A full color displaypixel 1-1 is constructed by summarizing the pixels of red, green andblue colors.

[0043] The size of full color display pixel 1-1 varies depending on thedisplay density. For example, the size is 127 λm×127 λm in the case of200 PPI (pixel/inch), and 254 μm×254 λm in the case of 100 PPI. Itfollows that width W of each display element (red, green and blue) isabout 30 μm in the case of 200 PPI and about 60 μm in the case of 100PPI, and the length L is about 120 μm in the case of 200 PPI and about240 μm in the case of 100 PPI. The gaps C1 and C2 between the red, greenand blue pixels are about 10 μm in the case of 200 PPI and about 20 μmin the case of 100 PPI.

[0044] Solution 6 can be filled into red colored pixels by shifting theflying electrode 3 of FIG. 1 in the direction of arrow V relatively tothe organic EL display 1 shown in FIG. 3.

[0045] Solution 6 can easily be filled into fine pixels while varyingthickness of the stringy solution beam 6-1 of FIG. 2 in accordance withthe width W.

[0046] Further, since the display pixels into which the solution 6 is tobe filled are as fine as have been mentioned above, the influence ofcapillary phenomenon can overpass gravity of solution 6, so thatsolution 6 can be filled into any of horizontally disposed organic ELdisplay 1 and upward disposed organic EL display 1.

[0047] At this time, a surplus adhesion of the solution to the gap C2part can be prevented by stopping the application of high voltage fromthe voltage application circuit 5 of FIG. 1 or by lowering the inputvoltage to stop the flying of solution 6 only in the areas correspondingto gap C2. Needless to say, it is also possible to continue the flyingof solution 6 without stopping the flying. After the filling into theflying row 1-R has been completed, the flying electrode 3 of FIG. 1 isshifted to the next row of pixel 2-R for red-colored display, in thedirection of arrow H relatively to the organic EL display 1 shown inFIG. 3.

[0048] Subsequently, the flying electrode 3 of FIG. 1 is shifted in thedirection opposite to the direction of arrow V, relatively to theorganic EL display 1 shown in FIG. 3, and the solution 6 is filled intothe red-colored display pixel row 2-R.

[0049] By repeating the above-mentioned procedures, solution 6 is filledinto all the red-colored display pixels on the organic EL display 1. Inthe same manner as above, solution 6 can be filled into green-coloredpixels 1-G, 2-G and blue-colored pixels 1-B, 2-B, too.

[0050] Needless to say, it is also possible to achieve a similar fillingof solution 6 by shifting the organic EL display 1 while fixing theflying electrode 3.

[0051] From the viewpoint of improving the productivity, it is desirableto dispose individual solution flying devices 2 for red, green and bluecolors of FIG. 1 in parallel to one another and carry out the flyingsimultaneously.

[0052] Further, it is desirable form the viewpoint of further improvingthe productivity to dispose a plurality of flying electrodes 3 inparallel in the solution flying device 2 of FIG. 1, and to carry out theflying simultaneously. Especially, productivity can further be improvedby making the flying electrodes 3 into a line in accordance with thesize of organic EL display 1.

[0053]FIG. 4 illustrates the a-a′ cross-sectional structure of theorganic EL display 1 of FIG. 3, wherein 11 is a bank, 12 is aninsulating layer made of SiO2 or the like, 13 is an electro-conductivelayer which is a positive pore-injecting layer, 14 is a transparentelectrode, 15 is a glass substrate, 1-R is a red-colored light emittinglayer, 1-G is a green-colored light emitting layer, and 1-B is ablue-colored light emitting layer. The insulating layer 12 may beomitted. As the transparent electrode 14, ITO (indium tin oxide), IZO(indium zinc oxide), and the like are used. In a case of using astructure of withdrawing the light from the upper part, it is alsopossible to use an opaque electrode made of a metal such as Cr, Al orthe like.

[0054] The same earthing effect as that brought about by the earthing ofelectro-conductive material 9 of FIG. 1 can be obtained by earthing eachof the transparent electrodes 14 for each of the display pixels whilemaintaining the transistors (not shown in the figure) for driving eachof the display pixels. Needless to say, it is also possible to disposean electro-conductive material 9 for earthing in the organic EL displayor under the glass substrate 15, besides the transparent electrode 14.

[0055] Bank 11 is constituted of a low dielectric constant material suchas polyimide resin or the like, and its thickness C1 is as depicted bythe C1 of the above-mentioned FIG. 3. Its height h is 2-10 μm, and its Wis as shown by the W in the above-mentioned FIG. 3. Solution 6 is filledinto the concavity surrounded by bank 11 by the use of theabove-mentioned solution flying device 2, after which thehigh-volatility solvent such as xylene or the like is vaporized off toform red-colored light emitting layer 1R, green-colored light emittinglayer 1G and blue-colored light emitting layer 1B all having a thicknessof 50-100 nm. Needless to say, the solution 6 can be filled in the samemanner as above and the same effect as above can be exhibited not onlyin the above-mentioned case of forming a three-colors light emittinglayer but also in the cases of forming two-colors or one-color lightemitting layer.

[0056] Herein, it is important to make small the surface roughness ofeach light emitting layer in order to improve the light-emittingcharacteristics. Surface roughness of each light-emitting layer can bemade small by continuously injecting the solution by the use of theabove-mentioned solution flying device 2.

[0057] After injecting the solution 6 into the concavity surrounded bybank 11 by the use of solution flying device 2 and vaporizing off thehigh-volatility solvent, the injection of solution 6 is repeatedadditionally, whereby surface roughness of each light-emitting layer canbe made smaller. Since the method of the repeated injection makes itpossible to reduce the amount of solution 6 injected at once, such amethod is effective for lowering the height h of bank 11 shown in FIG. 4and lessening the thickness of organic EL substrate.

[0058]FIG. 5 illustrates the c-c′ cross-sectional structure of theorganic EL display 1 of FIG. 3. In the organic EL display 1 of thisexample, bank 11 exists between the pixels even in the direction c-c′.Accordingly, if solution 6 is let fly continuously, the solution collideagainst the bank 11 present between pixels and is scattered to cause acolor mixing and an unevenness in the thickness of light emitting layerbetween pixels and a thereby caused uneven display.

[0059]FIG. 6 illustrates another example of the organic EL display. Inthis example, the red-colored light emitting layer 1-R′, green-coloredlight emitting layer 1-G′ and blue-colored light emitting layer 1-B′ inthe range of full color pixel 1-1 are continuously extended to the fullcolor display pixel 12 without partitioning with bank 11 and furtherprolonged until they reach the maximum length or the whole dimension oforganic EL display 1. By shifting the flying electrode tip 3-1 of FIG. 1in the direction of arrow V, injection of solution 6 becomes possibleand the above-mentioned effect of continuous flying of solution 6 can beenhanced. By shifting the flying electrode tip 3-1 in the direction ofarrow H, solution 6 can be injected into the ranges of red-colored lightemitting layer 2-R′, green-colored light emitting layer 2-G′ andblue-colored light emitting layer 2-B′. Herein, the transparentelectrode 14 shown in FIG. 4 and the driving transistors (not shown inthe figure) are disposed for individual colors of display pixel units.That is to say, the cross section b-b′ of FIG. 6 is the same as that inFIG. 4. The dimension W and C1 in FIG. 6 are the same as the dimension Wand C1 in FIG. 3. FIG. 7 illustrates the d-d′ cross-sectional structureof FIG. 6. In the organic EL display of this example, no bank existsbetween pixels in the direction of d-d′, and the solution 6, if made tofly continuously, does not collide with the bank and is not scattered.Thus, no color mixing nor uneven display caused by unevenness inthickness of light emitting layers between pixels occurs in this case,unlike in the preceding example.

[0060] After forming light emitting layers, a cathode 20 is formed andits upper part is sealed by the use of a sealing can to obtain anorganic EL display, as seen in the cross-sectional view of FIG. 8. Incases where light is to be withdrawn from the upper part, an opaqueelectrode is formed in place of the transparent electrode 14 of thisexample, and a charge injecting layer and a transparent payer are formedafter formation of the light emitting layer and a transparent sealingcan is used, whereby an organic EL display making it possible to takeout light from its upper part can be obtained.

[0061]FIG. 9 is a schematic view of an image display device using theorganic EL display of this example. In the image display device 61, thenearly central part of substrate 66 functions as a display part 62. Adata driving circuit 63 outputting image signals to the data line 67 isprovided over the display part 62, a scanning circuit 64 outputting thescanning signals to the gate line 68 is provided in the left side, and acurrent feeding driving circuit 65 is provided in the right side. Thesedriving circuits 63, 64, 65 are constituted of a shift resistor circuitconstituted of a complementary circuit made from N-channel type andP-channel type of TFT, a level shifter circuit, an analogue switchcircuit, etc.

[0062] The use of the above-mentioned solution flying device 2 is notrestricted to the production of organic EL display, but it can beapplied to other devices, too. One example of said other device is shownin FIG. 10, which is a structural cross-sectional view of a color filterproduced by the use of the solution flying device 2 shown in FIG. 1, inwhich the organic EL device 1 is replaced by a color filter.

[0063] In FIG. 10, 100 is a color filter, 150 is a glass substrate, 130is a transparent electrode, and 110 is a black matrix made of a resin. Ared-colored filter pixel 10-R, a green-colored filter pixel 10-G and ablue-colored filter pixel 10-B are constructed in the concavitypartitioned by black matrix 110. In the solution flying device 2 of FIG.1, solution 6 is a solution prepared by dissolving light-transmittingpigments or light-transmitting dyes of red, green and blue color in asolvent having a high electric resistance such as isoparaffin, and itselectric resistance and surface tension are preferably equal to thoseused in the organic EL display. A high voltage is applied between thetip 3-1 of flying electrode of FIG. 1 and the ITO transparent electrode130 of FIG. 6 to make fly a stringy solution beam 6-1 and inject thebeam into the above-mentioned concavity, whereby a red-colored filterpixel 10-R, a green-colored filter pixel 10-G and a blue-colored filterpixel 10-B are formed.

[0064] By such a procedure, there is provided a production device ofcolor filter which can form a color filter constituted of a red-coloredfilter pixel 10-R, a green-colored filter pixel 10-G and a blue-coloredfilter pixel 10-B in the same dimensions as in FIG. 3 and FIG. 6 in highuniformity. Since this device uses no fine nozzles, the color filterthus obtained has a high reliability due to freeness from clogging offine nozzle.

[0065]FIG. 11, FIG. 12 and FIG. 13 illustrate the solution flying device2 of FIG. 1. These are outlined structural diagrams according to anotherexample. FIG. 11 is a top plan cross-sectional view of the solutionflying device. FIG. 12 is an a-a′ cross-sectional view of FIG. 11. FIG.13 is a b-b′ cross-sectional view of FIG. 12. The flying electrode 31and control electrode 32 are formed by hot contact-bonding a resin film(for example, a negative photosensitive resin film) 34 of a lowdielectric constant material (specific permittivity 3 or less) on aglass substrate 33, vapor depositing a metallic film thereon, andcarrying out a photo-lithographic wet etching. The tip 31-1 of theflying electrode is protruded from the terminal surface of glasssubstrate 33. The tip of flying electrode 31-1 has a sharp pointed angleand such tips are disposed in parallel to one another at constantintervals as shown in FIG. 11. Further, the flying electrode 31 andcontrol electrode 32 are coated with an insulating protective film 35.On the other hand, the tip 32-1 of control electrode is placed at aposition which is retrograde from the tip 31-1 of flying electrode andprotruded from the terminal surface of glass substrate 33. The controlelectrodes 32 are disposed at constant intervals between the flyingelectrodes 31.

[0066] Since the tip 32-1 of control electrode is covered with a lowdielectric constant resin film 34 through intermediation of insulatingprotective film 35 and is protruded, it plays a role of mechanicallyintercepting the solution meniscus between the adjacent flyingelectrodes 31 and a role of intercepting an interference of the electricfield between the adjacent flying electrodes 31 and, at the same time,it makes it possible to fly the solution evenly with a lessenedinfluence of the adjacent flying electrodes 31 such as bending of flyingsolution beam and unevenness of thickness. In order to make moreefficient the action of mechanically intercepting the solution meniscusbetween adjacent flying electrodes 31, it is desirable to make theheight s of the tip of control electrode equal to or greater than theheight h of the solution path.

[0067] The tip of control electrode is made of a dielectric resin and soconstructed as to cover the tip of a metallic control electrode andprotrude from the terminal surface of glass electrode 33. Needless tosay, the same effect as above can be achieved by forming a similar shapeonly from a metallic control electrode.

[0068] As shown at FIGS. 12 and 13, by subjecting a resin film 36 of lowdielectric constant material (for example, negative type photosensitiveresin film) which has been hot contact bonded onto insulating protectivefilm 35 to a lithographic wet etching, the solution feeding path 37 inthe solution flying device 2 is formed over and along the flyingelectrode 31.

[0069] Subsequently, a resin film of low dielectric constant material(for example, a negative type photosensitive resin film) 38 is put onthe solution feeding path 37, and hot contact bonded onto theabove-mentioned dielectric resin film 36 to close the solution feedingpath 37 tightly, after which the solution feeding hole 39 is formed bywet etching. Then, cover 40 is bonded onto the low dielectric constantresin film 38. Thus, it becomes possible to supply the solution 6 to thesolution feeding path 37.

[0070] As shown in FIG. 11, the solution feeding path 37 is formed alongthe flying electrode 31, to which is supplied the solution 6 in thedirection of arrow, and the solution supplied flows toward the tip 31-1of the flying electrode.

[0071] In FIGS. 11 and 13, three flying electrodes 31 and four controlelectrodes 32 are pictured for convenience. It is needless to say,however, that numbers of flying electrodes 31 and control electrodes 32can be varied in the range of from several tens to several thousands inaccordance with the use of solution flying device 2 by alternatelydisposing a flying electrode 31 and a control electrode 32, and amulti-channel type solution flying device and a line type solutionflying device can be constructed based on the same idea as above.

[0072] In this state, a voltage is input on each of the flyingelectrodes 31 by means of the voltage applying circuit 50. The contentof the solution is the same as has been mentioned above. Thus, byapplying a voltage from the voltage applying circuit 50 of FIG. 11, anelectric field is formed between the earthed electro-conductive material9 and the organic EL display 1, and solution 6 becomes able to fly inthe form of solution beam 6-1.

[0073] It is also possible to provide another voltage applying circuit(not shown in the figure) for applying a voltage lower than an appliedvoltage of voltage applying circuit 50 to each of the flying electrodes31 in series with the voltage applying circuit 50 in a state that avoltage from the voltage applying circuit 50 is applied to each of thecontrol electrodes 32, in order to control the flying of solution beam6-1 from each flying electrode 32 by on/off change of said anotherapplying circuit.

[0074] Next, the structure for recovering the residual solution afterthe flying of solution will be explained by referring to FIG. 12 andFIG. 13. A minute gap 42 having a constant dimension g is providedbetween the tip 33-1 of a glass substrate having a sloped surface in theside closer to the flying electrode and the solution recovering member41. The above-mentioned residual solution can be recovered into thesolution recovering path 43 formed of the solution recovering member 41and the sloped glass substrate 33, downward the tip 31-1 of flyingelectrode, at an angle crossing with the direction of the flyingelectrode tip 31-1, along the terminal surface 33-1 of glass electrode.

[0075] It should be further understood by those skilled in the art thatthe foregoing description has been made on embodiments of the inventionand that various changes and modifications may be made in the inventionwithout departing from the spirit of the invention and the scope of theappended claims.

[0076] Effects of the Invention

[0077] According to the production device of organic EL display capableof making a full color display of this invention, there can be provideda production device capable of forming a uniform light emitting layerand free from clogging of nozzles, and there can be provided an organicEL display which is uniform and free from color mixing.

What is claimed is:
 1. A device for producing a color filter having:means for storing a solution in which a light transmitting material isdissolved; means for feeding the solution to a tip of a flyingelectrode; means for applying a voltage between the tip of the flyingelectrode and an electro-conductive material of a color filter substrateso as to form an electrostatic field; and means for relatively shiftingthe tip of the flying electrode and the color filter substrate to aperpendicular direction and to a horizontal direction; wherein thesolution is formed into a stringy beam which is let to fly onto thecolor filter substrate so that the solution is injected into a concavityformed and surrounded by a black matrix on the color filter substrate,and forms red, green and blue light emitting layers.
 2. The device forproducing a color filter according to claim 1, wherein a thickness ofthe stringy beam of the solution is varied by controlling theelectrostatic field.
 3. The device for producing a color filteraccording to claim 1, wherein the amount of injection of the solution isvaried by controlling a velocity of relative shifting of the tip of theflying electrode and the color filter substrate to a perpendiculardirection.
 4. The device for producing a color filter according to claim1, wherein the means for forming an electrostatic field includesapplying a voltage obtained by in-series overlapping of a pulse voltageon a direct current voltage of bias, and the stringy beam isintermittently cut by controlling the electrostatic field.
 5. The devicefor producing a color filter according to claim 1, wherein the solutionis injected into the concavity formed and surrounded by the back matrixand, after vaporizing off of a solvent, the injection of the solution isrepeated.
 6. The device for producing a color filter according to claim1, wherein the device has a plurality of the flying electrodes.